Date: Fri, 29 May 1998 08:46:42 +0930 From: Matthew Thyer <Matthew.Thyer@dsto.defence.gov.au> To: Greg Lehey <grog@lemis.com> Cc: Karl Pielorz <kpielorz@caladan.tdx.co.uk>, current@FreeBSD.ORG Subject: Re: aha1542 - again... Message-ID: <356DF05A.E4B3AE09@dsto.defence.gov.au> References: <Pine.BSF.3.96.980528000408.626A-100000@caladan.tdx.co.uk> <19980528123712.H4179@freebie.lemis.com>
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I am about to add a 1542B to my current system and want to know about the bounce buffer issue. How do I tell whether the device I'm adding does DMA ? Do the probe messages tell me ? It's an ISA card and its an Adaptec 1542B so I assume being a SCSI card it will do DMA so I suppose I should include BOUNCE_BUFFERS since I have 32MB RAM on this P100. Greg Lehey wrote: > > On Thu, 28 May 1998 at 0:07:15 +0100, Karl Pielorz wrote: > > > > Hi, > > > > I read a while ago there were problems with the existing AHA1542 support > > on -current... I also read that someone (I can't remember now who it was) > > said they'd been through the code and fixed up a few things... > > > > As I remember it was a problem to do with bounce buffers... > > > > I've just had to add a 1542CF to my machine (as I'm out PCI slots and it > > was 'hanging around'), and I've run into problems with it - but I'm not > > sure there to do with bounce buffers etc. > > > > I know CAM is looking almost 'immanent' - but can anyone confirm whether > > the 1542 driver is in any useable state in -current at the moment? > > I'm developing vinum on a -CURRENT machine with a 1542B. I had > trouble with a 1542A, which appears to be a known problem (a number 0f > 0xff bytes strewn at regular intervals, usually 32K), but the 1542B is > working fine. > > > I have 2 x Double-Speed CD-ROM drives hooked up to it, I wouldn't have > > thought they were particularly 'stressy' for the driver ;-) > > Do you have problems? You'll need bounce buffers for any ISA DMA > device if you have more than 16 MB memory. > > Greg > -- > See complete headers for address and phone numbers > finger grog@lemis.com for PGP public key > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message -- Matthew Thyer Phone: +61 8 8259 7249 Corporate Information Systems Fax: +61 8 8259 5537 Defence Science and Technology Organisation, Salisbury PO Box 1500 Salisbury South Australia 5108 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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